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riscv: refactor the IPI code

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This prepares for adding native non-SBI IPI code.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Atish Patra <atish.patra@wdc.com>
Signed-off-by: Paul Walmsley <paul.walmsley@sifive.com>
This commit is contained in:
Christoph Hellwig 2019-08-21 23:58:32 +09:00 committed by Paul Walmsley
parent 51bc620ba9
commit 7e0e50895f
1 changed files with 31 additions and 24 deletions
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55
arch/riscv/kernel/smp.c
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@ -78,13 +78,38 @@ static void ipi_stop(void)
wait_for_interrupt();
}
static void send_ipi_mask(const struct cpumask *mask, enum ipi_message_type op)
{
int cpuid, hartid;
struct cpumask hartid_mask;
cpumask_clear(&hartid_mask);
mb();
for_each_cpu(cpuid, mask) {
set_bit(op, &ipi_data[cpuid].bits);
hartid = cpuid_to_hartid_map(cpuid);
cpumask_set_cpu(hartid, &hartid_mask);
}
mb();
sbi_send_ipi(cpumask_bits(&hartid_mask));
}
static void send_ipi_single(int cpu, enum ipi_message_type op)
{
send_ipi_mask(cpumask_of(cpu), op);
}
static inline void clear_ipi(void)
{
csr_clear(CSR_SIP, SIE_SSIE);
}
void riscv_software_interrupt(void)
{
unsigned long *pending_ipis = &ipi_data[smp_processor_id()].bits;
unsigned long *stats = ipi_data[smp_processor_id()].stats;
/* Clear pending IPI */
csr_clear(CSR_SIP, SIE_SSIE);
clear_ipi();
while (true) {
unsigned long ops;
@ -118,23 +143,6 @@ void riscv_software_interrupt(void)
}
}
static void
send_ipi_message(const struct cpumask *to_whom, enum ipi_message_type operation)
{
int cpuid, hartid;
struct cpumask hartid_mask;
cpumask_clear(&hartid_mask);
mb();
for_each_cpu(cpuid, to_whom) {
set_bit(operation, &ipi_data[cpuid].bits);
hartid = cpuid_to_hartid_map(cpuid);
cpumask_set_cpu(hartid, &hartid_mask);
}
mb();
sbi_send_ipi(cpumask_bits(&hartid_mask));
}
static const char * const ipi_names[] = {
[IPI_RESCHEDULE] = "Rescheduling interrupts",
[IPI_CALL_FUNC] = "Function call interrupts",
@ -156,12 +164,12 @@ void show_ipi_stats(struct seq_file *p, int prec)
void arch_send_call_function_ipi_mask(struct cpumask *mask)
{
send_ipi_message(mask, IPI_CALL_FUNC);
send_ipi_mask(mask, IPI_CALL_FUNC);
}
void arch_send_call_function_single_ipi(int cpu)
{
send_ipi_message(cpumask_of(cpu), IPI_CALL_FUNC);
send_ipi_single(cpu, IPI_CALL_FUNC);
}
void smp_send_stop(void)
@ -176,7 +184,7 @@ void smp_send_stop(void)
if (system_state <= SYSTEM_RUNNING)
pr_crit("SMP: stopping secondary CPUs\n");
send_ipi_message(&mask, IPI_CPU_STOP);
send_ipi_mask(&mask, IPI_CPU_STOP);
}
/* Wait up to one second for other CPUs to stop */
@ -191,6 +199,5 @@ void smp_send_stop(void)
void smp_send_reschedule(int cpu)
{
send_ipi_message(cpumask_of(cpu), IPI_RESCHEDULE);
send_ipi_single(cpu, IPI_RESCHEDULE);
}